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(No Model.)

J.BORDEN AVE. MECHANISM FOR MAKING GOILS FOR METAL SKELETONS FOR 0m oo 00 1 9 1 r m d Lw S m mt a GP U R T S E T I S O P. M O. G

WITNESSES:

UNlTED STATES PATENT OFFICE.

JEAN BORDENAVE, or rams, rnanon.

MECHANISM FOR MAKlNG COILS FOR METAL SKELETONS FOR COMPOSITE STRUCTURES.

SEPECIFICATION forming part of Letters Patent No. 399,484, dated March 12, 1889.

Application filed Sept-ember 26, 1887. Serial No. 250,778,

(No model.) Patented in France March 10,1887,N0. 182,095yin1taly March 22,1887,XX1,21,405,XL11, 357; in England March 23, 1887, No. 4,386, and in Spain March 30,1887,No,1O,748.

. Improvements in Mechanism for Making Coils for Metal Skeletons tor Composite Structures, (for which patents have been granted in France, No. 182,095, dated March 10, 1887; in England, No. 386, dated March 23, 1887; in Spain, No. C. A., 10,718, March 80, 1887, and in Italv No. XXI, 21,405, XLll, I357, dated March 22, 1887,) of-which the following is a specification.

Mv invention relates to the manufacture of iron skeletons lfor use in building conduits composed of metallic skeletons embedded in cement or concrete.

The metal skeleton of such strlu'ttnres usually consists of bar-iron of plain uniform section, as square or round. iron, for the reason that bars with this form of section are more easily bent to the proper curvature for the transverse members or ribs than iron having sections of higher or more complex development, as T and I iron, for example; but the ordinary iron has not the 'rength and stiltness in proportion to its cro. section that the latter has. The dilfie ulty i n employing T and I iron as sold by the trade is that in bendin g it while cold to the curved form required in the structure the metal inside is unduly compressed, while that outside is unduly distended. Thusthebendingweakensandtorms cracks in the iron and renders it unlit for use in the conduit.

It the iron be heated before the bending, these ditliculties will be partially, but not wholly, overcome, and this heating will add verv materially to the expense.

The object of my invention is to avoid the above difficulties and to enable iron or highlydeveloped section to be em ployed, and this I effect bv winding the iron of the proper section as it comes from. the rolls in the mill (and of course while still. very hot and plastic) directly upon a drum-like form, which has the proper contour that is required for the metal skeleton of the structure. The metal is wound upon the form helically or spirally, the pitch being precisely that required in the finished skeleton. The drum like form on which the metal is wound is pro-' vided with a spiral groove to receive the bar and give the proper pitch to the spiral, and said drum is splined on its shaft in order that it may move endwise or longitudinally thereon and adapt itself to the rolls as the winding proceeds.

In order that my invention may be the better understood, I will describe it with reference to the accompanying drawings, wherein Figure 1 is a sectional elevation, and Fig. 2 is a plan, of the mechanism [or rolling and winding on the bar which forms the spiral of the skeleton. Fig. 23 is a view illustrating the manner of bundling the spiral coils for convenience o'l' transpm-tation. Fig. 4. is a view of the bundled coil. Fig. 5 is a side view, and Fig. ti an end view, of the mechanism for building up the skeleton.

Referring to Figs. 1 and 2, as the bar u of iron to form the spiral issues from the rolls A it is wound upon a drum, B, provided with a helical groove, 7), in its surface to receive the bar. The grooves or lands between the spirals of the groove I; are of the exact width that is required for the spaces between the spirals oi the skeleton. The automatic endwise movement of the drum 1% required to adapt it. to receive thebarproperly as it comes from the rolls may be effected by means of a fixed stud, c, which engages the spiral groove 7) in the drum. Thus the drum is driven endwisc b its own rotation like a screw. The coil thus formed may be compactly bundled for transportation b v compressing the spirals together, as shown in Fig. 3, and tying them togetl'ier with wires c c, for example. Fig. 4 shows the bundle or package thus tied up.

In the preceding des('-ription .l have illustrated the winding of a cylindrical coil destined to form a pipe. 111 order to build up the skclcttn'i, the coil o o is slipped on a drum or mandrel, the ligatures c c renmved, and the spirals propm'ly dist anecd or spaced as thcv were when the coil was originally wound. The longitudinal bars or rods ff are slipped into longitudinal llutes or grooves forn'ied in the periphery of the drum 0 and properly spaced. These longitudinal bars or rods and the spirals are then tied 01' ligatured Where they cross each other by Wires 9 g, and this completes the section of the skeleton. The skeleton thus constructed may be laid or set and the cement or concrete applied in any manner. This application of the cement forms no part of my present invention.

The drum B need not be cylindrical. It

may have any sectional contour suited to the peripheral groove to receive the bar and being capable of endwise movement, substantially as set forth.

2. The combination, with the rolls A for rolling the flanged bar, of the drum B, rotatively mounted adjacent to the rolls and having a peripheral spiral groove, 5, to receive the bar from the rolls, said drum being free to move longitudinally, and a fixed stud, as c, engaging the spiral groove in the drum and serving to feed the latter endwise, substantially as set forth.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JEAN BORDENAV'E.

\Vitnesses:

ALEXANDRE GAUTIERE, AMAN'D B TTER. 

